This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 19 |
| 4 | 68 |
| 5 | 190 |
| 6 | 610 |
| 7 | 1618 |
| 8 | 4870 |
| 9 | 12776 |
| 10 | 37270 |
| 11 | 97264 |
| 12 | 277858 |
| 13 | 723856 |
| 14 | 2039120 |
| 15 | 5309076 |
| 16 | 14805780 |
| 17 | 38549984 |
| 18 | 106693682 |
| 19 | 277890081 |
| 20 | 764597138 |
| 21 | 1992327855 |
| 22 | 5456154914 |
| 23 | 14224333948 |
| 24 | 38806355844 |
| 25 | 101220914578 |
| 26 | 275278038948 |
| 27 | 718383950316 |
| 28 | 1948531080114 |